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| n | a(n) |
|---|---|
| 5 | 0 |
| 6 | 1 |
| 7 | 2 |
| 8 | 8 |
| 9 | 36 |
| 10 | 185 |
| 11 | 1050 |
| 12 | 6421 |
| 13 | 40623 |
| 14 | 261828 |
| 15 | 1701370 |
| 16 | 11098331 |
| 17 | 72534862 |
| 18 | 474641785 |
[0,1,2,8,36,185,1050,6421,40623,261828,1701370, 11098331,72534862,474641785] |